Announcing the deal in a blog post, Google Voice product managers Wesley Chan and Craig Walker
did not offer a glimpse into any features that could come from the
integration, but said that Gizmo5 engineers would be joining Google to work
on the two products.

It remains unclear how Gizmo5 will be integrated into Google's expanding
telephony venture, but it appears to take the firm one step closer to a
full-fledged VoIP service that could rival Skype.

The Google Talk product already enables users to make voice and video
calls from one computer to another, though there is no connection to
traditional landline or wireless phone numbers.

Meantime, the higher-profile Google Voice is not a VoIP service itself,
but it comes awfully close. Google Voice sets up an online clearinghouse for
users' multiple phone numbers, offering the ability to route calls through a
single number, as well as a host of other bells and whistles, such as
voice-mail transcription and blocking unwanted calls.

But Google Voice is not set up to be a substitute for wireline or
cellular service. Google Voice, though it issues users a unique number to
access the service, still requires users to have a phone number through an
outside provider, and sources at Google have said they have no plans to
depart from that model anytime soon.

In fact, Google is in the process of negotiating number-porting deals
with carriers to bring the full complement of Google Voice services under
the mantle of a Google-issued number.

Google also knows that it has to tread carefully with its entrée into the
telephony sector. Google Voice has already come under scrutiny from the Federal Communications
Commission for its policy of restricting calls in certain rural areas.
AT&T
and several like-minded lawmakers have argued
to the commission that Google's selective offering of the free service runs
counter to its long-standing support of Net neutrality, and made the case
that Google Voice is a telecommunications service subject to government
regulation.

Google, of course, has disputed that claim, arguing that Voice is nothing
more than a software application, explaining that the call restrictions are
limited to a small number of rural numbers that engage in so-called traffic
pumping schemes, teaming with call-center providers and adult chat services
to drive up connection fees.

Members of the Google Voice team have been in Washington this week
demonstrating the product to staffers at the FCC.